Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26c2a8d5e189c4e…

MALICIOUS

PDF

61.6 KB Created: 2020-11-20 02:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ea1d64d2138122d4c5b920f137e77661 SHA-1: de965570464162e5fdc1f15fa549841a6e5bcc74 SHA-256: b26c2a8d5e189c4e99e8846f217b0c20e00eb413a24615863d150308e1009f74
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?utm_term=bunting+template+microsoft+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f9d88e6afc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f94f88e4f6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fac1dbe5ad42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5fa77839c5ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_5fa450875acfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f8f9464edc06.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/aaff5a340f3502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_5fb7059cefbb1.pdfIn PDF document text
    • https://panofokolonap.weebly.com/uploads/1/3/4/4/134483377/2630377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/hanukkah_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/abigael_bohrquez_poemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64e4796-2775-4318-9df3-636660d6d965/acad_menu_missing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abee8039-e85a-4424-8bbf-f65d98da5e1c/mandala_con_operaciones_para_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6aa6f37-6be4-4644-9e80-0e8badcef107/pioneer_sound_bar_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892a2c14-66a6-467f-a949-dbc1b91360f8/rojukuwanupogelalezabid.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F1 5616 bytes
SHA-256: 74651014674675b5662f7600c6b723a8ca616852222d68b4682c7820e61ac958
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 9668 bytes
SHA-256: 9604d24a3c6c941db723ad701d743c7bc1816eb3ca38f627aeb3af635be26ac7

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